JPH04175902A - Programmable controller system - Google Patents

Abstract

PURPOSE:To enable an operator to easily know the mutual relation between the relative program of a main program and subroutine programs by providing a code detecting mans, an information extracting means, and a display means. CONSTITUTION:This programmable controller system is equipped with a code detecting means 1000 which detects the information codes in a sequence program to be displayed and also equipped with the information extracting means 1100 which extracts input/output parameters used by sequence instructions from a partial program within the range of the sequence program to be displayed which is indicates by the detected information codes. Further, the system is equipped with a display means 1200 which displays the extracted input/output parameters at a specific position. Consequently, when execution instructions of subroutine programs are displayed, input/output parameters indicating the contents of the subroutine programs can be displayed nearby a display of the execution instruction of the subroutine programs, so that the operator can know the mutual relation between the main program and subroutine programs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a programmable controller system that automatically controls electronic equipment by executing a sequence program.

[Prior Art 1] Conventionally, in order to reduce the effort of a user to create a sequence program, a description method using subroutines (branches) has been used for partial programs that are used multiple times in a sequence program. That is, the above-mentioned partial programs in the commonly used sequence program are written in the sequence program with an identification name separately from the main program (this written partial program is called a subroutine program). , the location where the above subroutine program is used in the main program contains the subroutine program's identification name, and the subroutine program execution instruction (also called a macro instruction)
Describe.

When a sequence program is executed by a programmable controller, when the central processing unit (C: PU) inside the programmable controller detects the above execution instruction in the main program, the CPU moves the execution procedure to a subroutine program and executes the subroutine program. After that, the execution procedure is returned to the main program position before the movement, and the calculations of the main program are executed thereafter.

By using such a program description method, the user only needs to write the same partial program once to be executed repeatedly, and there is no need to write it multiple times.

[Problem to be Solved by the Invention l] In a sequence program created using the method described above, the main program and the subroutine program are written separately as described above, so it is necessary to write both the main program and the subroutine program on the programming device. cannot be displayed on the display screen.

Therefore, there was a problem in that it was difficult for the user to determine the mutual relationship between the main program and the subroutine program.

This point will be explained in detail.

The sequence program is processed in the form of an information code signal in the programmable controller. A sequence program in which this information code signal is expressed in character (monic expression) is shown in FIG.

Programming device for the sequence program of the above information code signal! Now, convert it into a graphic form of a sequence circuit and display it.

The execution command “CALL” of the subroutine program in the sequence program of the monic expression shown in FIG.
PlooO” is displayed as is even in the sequence circuit diagram.

If the operator wants to view a subroutine program, he switches the display screen by moving both sides, etc., and changes the display program to the subroutine program position. As a result, the previously displayed main program disappears from the display screen. For example, when an arithmetic expression is defined in a subroutine program and data used in the arithmetic expression is defined in a main program by an input/output parameter in a sequence instruction, there is a mutual relationship between the arithmetic expression and the input/output parameter.

Therefore, the conventional programmable controller system still needs improvement in that the operator must alternately display the main program and subroutine program multiple times when checking the sequence program.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to enable an operator to understand the mutual relationship between the main program and the subroutine program without switching the display screen when there is an execution command for a subroutine program written in the main program. The purpose of the present invention is to provide a programmable controller system that can be used as a programmable controller.

[Means for Solving the Problems 1] In order to achieve such an object, the present invention indicates the range of a partial program in a sequence program, predetermines information codes that are not subject to sequence calculations, and specifies information codes to be displayed. A code detection means detects the information code written in the sequence program, and an input used for the sequence instruction is detected from the partial program in the range indicated by the detected information code in the sequence program to be displayed. information extraction means for extracting output parameters;
The present invention is characterized by comprising display means for displaying the extracted input/output parameters at a predetermined position.

[Operation j] In the present invention, a range of a subroutine program or a related partial program in a main program is specified by a specific information code.

This information code is detected when displaying a sequence program, and input/output parameters are extracted from the program range indicated by the information code. Next, the input/output parameters are displayed at the positions of the subroutine programs and related programs to inform the operator of the interrelationship between the subroutine programs and related programs. Furthermore, since the displayed content does not include an instruction portion, the display area for input/output parameters is small.

Embodiments] Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the basic configuration of an embodiment of the present invention.

In FIG. 1, the range of a partial program in a sequence program is shown, and information codes that are not subject to sequence calculations are predetermined.

1000 is code detection means for detecting the information code written in the sequence program to be displayed.

Reference numeral 1100 denotes information extraction means for extracting input/output parameters used for sequence commands from a partial program in the range indicated by the detected information code in the sequence program to be displayed.

1200 is a display means for displaying the extracted input/output parameters at a predetermined position.

FIG. 2 shows an example of the main configuration of a programmable controller system to which the present invention is applied.

In FIG. 2, CPU10, system program memory 20. User program memory 30. Data memory 40. A system data memory 50 and an input/output interface (Ilo) 60 are connected to the common bus.

The CPU 10 not only controls the operation of the entire device according to a system program, which will be described later, stored in the system program memory 20, but also executes a sequence program stored in the user program memory 30 to automatically control the electronic equipment.

The data memory 40 stores information signals exchanged with electronic devices to be controlled.

The system data memory 50 is used for temporary storage of system-related data used in the CPU10.

11060 transfers signals exchanged between programming device 70 and CPU 10.

The system program memory 20 stores the following system programs.

(1) A program for translating a sequence program into a program language executable on CPU10.

(2) A program for exchanging sequence programs with the programming device 60 and reading/writing the sequence programs into the user memory 30.

(3) Other system-related programs.

Next, system control commands related to the present invention and used in the sequence program will be explained.

FIG. 3 shows an example of a main program in the sequence program, and FIG. 4 shows an example of a subroutine program.

In this embodiment, an information code indicating the range of the main program related to the subroutine program is newly provided, and when displaying the sequence program, when reading the sequence program from the user program memory 30,
The input/output parameters (identification names of input/output data used in sequence instructions) described in this range are
Extract by 0.

The present invention uses "CALLUM" as shown in FIG. 3 as the information code (first code) indicating the beginning part of this range, and after this information code, the identification name of the related subroutine program (or the start step number of the subroutine program). Add.

"UM END" is used as the information code (end code) indicating the end of the range of the subroutine related program.

Furthermore, the execution command for the subroutine program is E.
XE" is used.

Also, the beginning part of a subroutine program.

As shown in Figure 4, the suffix is ``UMSTA''.
BTr subroutine program identification name.

Use the information code "UM RET".

The processing procedure of the CPU 10 when executing a sequence program written in such a format will be explained with reference to the flowchart shown in FIG.

When an instruction to start the system is input from the programming device 70 in FIG. 2, the CPU 10 initializes the read address to the first address of the user program memory 30 and sequentially reads out the sequence instruction codes starting from the first one (steps SlO to 520). ).

CPUl0 compares the read sequence instruction code and the first code "CALL UM" code, and determines the first code ("CALL UM" code) for the subroutine related program in the read sequence instruction.
is detected (steps S20 to S40).

At this time, CPU10 operates as the code detection means of the present invention.

If the determination process in step S40 is negative, the sequence instruction code is translated into machine language as in the past, and then
Execute the process specified by this sequence instruction code (
Steps S40-550).

In this way, the CPU 10 sequentially reads the sequence program instruction codes from the user program memory and executes the operations (steps S40→S50→S60→S
When the first code as shown in FIG. 3 is detected, the subroutine flag is set on and the subroutine program name included in the first code is temporarily stored in the system data memory 50. Note that turning on the subroutine flag indicates that the read sequence instruction code is located between the first code and the last code.

Translation processing is not performed on the read first code, and the next sequence instruction code is subsequently read (step S40).
→5100→5IIO→S60-320).

Since the subroutine flag is on, the identification processing procedure for the normal sequence instruction code that will be read thereafter follows the path of steps S30-5200-3300→5320.

In step 5320, the input/output parameters in the sequence instruction code are temporarily stored in the system data memory 50 by CPU10. The cpuio at this time operates as the information extraction means of the present invention.

After this, the read sequence instruction code is set at step S5.
It is handed over to sequence instruction execution processing of 0.

Further, if it is detected that the read sequence command code is the subroutine flag execution command code "EXE", the subroutine program name temporarily stored in the sequence data memory 50 is read out and the subroutine program with this name is executed. (Step 5200→
5210).

The read sequence instruction code is the last code “IM E”.
ND", the subroutine flag is turned off and the process of extracting input/output parameters from the subroutine-related program ends.

Thereafter, the above-described procedure is repeatedly executed, and when the final code of the sequence program is detected, the execution of the first sequence program at startup is ended.

When an operator inputs an instruction to display a sequence program from the programming device 70, the CPU 10 transfers the sequence program to the user programming device.

By inserting the input/output parameters extracted at this time into a predetermined position related to the subroutine program of the sequence program, the input/output parameters can be displayed on the display on the programming device side (display means of the present invention), thereby allowing the subroutine To inform an operator of the mutual relationship between a program and the main programs before and after it.

In this embodiment, a conventionally well-known procedure may be used to extract input/output parameters from sequence instructions of a subroutine-related program, but a typical process will be briefly explained.

A program instruction, not limited to a sequence instruction, is composed of an information code (operand) representing the contents of an instruction operation and an information code representing various data (parameters) related to the instruction operation. These information codes are written in the program according to a predetermined code system and writing order (format), so in this embodiment, the CPU 10 compares the code of the read sequence instruction with various prescribed codes to read the sequence instruction. Identifies code content. Also, based on the order of description, memory (or CP)
The parameter information is extracted by reading (input/output) parameter information in the program instruction code stored in the register (in U) by the CPU10.

The following various examples can be given as display formats of input/output parameters for reporting this correlation.

(1) Automatically display eight parameters on the main program side in connection with the display of the subroutine program.

(2) Since the input/output parameters are also used within the subroutine program, the input/output parameters are automatically displayed in addition to the graphical display of the subroutine execution command of the main program (see FIG. 5).

(3) When an operator instructs input/output parameters to be displayed, the programming device 70 displays the input/output parameters at the display screen position specified by the operator.

Further, the present invention can be practiced by modifying this embodiment as follows.

(1) In this embodiment, the input/output parameters included in the sequence instructions sandwiched between the first code and the last code in the main program are extracted and displayed, but the sequence instructions in the subroutine program The input/output parameters may be extracted and displayed in the main program. In this case, in the procedure shown in FIG. 6, the start/end codes in the main program are read as the start/end codes in the subroutine program.

(2) In this embodiment, the input/output parameters are extracted the first time the programmable controller executes the sequence program, but the extraction timing is also determined when the sequence program to be executed is received from the progeramink device 70. , programming device 7
When transmitting the sequence program to be displayed to 0, input/output parameter extraction processing can be performed.

In addition, since the sequence program created or received from the programmable controller is stored in the memory on the programming device 70 side, input/output parameter extraction processing may be performed when displaying the sequence program by the CPU in the programming device. For this purpose, the processing procedure of this CPU is shown in FIG.

(3) In this embodiment, input/output parameters are extracted from subroutine-related programs, but the system memory is not limited to subroutine-related programs, and multiple program command groups for instructing specific system operations can be stored in the system memory. The present invention can also be applied to program instructions (generally called macro instructions) that instruct the CPU 10 to execute the plurality of program instructions.

[Advantageous Effects of the Invention 1] As explained above, according to the present invention, when displaying an execution command of a subroutine program, input/output parameters indicating the contents of the subroutine program can be displayed near the display of the execution command of the subroutine program. . Therefore, the operator can easily know the mutual relationship between the related programs of the main program and the subroutine programs. Furthermore, since the display area of the input/output parameters is small, they can be displayed together with the main program on one screen, and there is no need to switch the display screen as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a specific circuit configuration example of the embodiment of the present invention, and FIG. 3 is an example of a sequence program of the embodiment of the present invention. FIG. 4 is an explanatory diagram showing an example of a subroutine program according to the embodiment of the present invention. FIG. 5 is an explanatory diagram showing an example of a display according to the embodiment of the present invention. FIG. FIG. 7 is a flowchart showing the second extraction processing procedure of input/output parameters according to the embodiment of the present invention, and FIG. 8 is an explanatory diagram showing the correspondence between the conventional sequence program and its display contents. It is. 10...cpu. 20... System program memory, 30... User program memory, 50... System data memory, 70... Programming device. The circuit configuration of this 4e1M example is shown in Figure 2.
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Claims (1)

[Claims] 1) A code that indicates the range of a partial program in a sequence program, predetermines information codes that are not subject to sequence calculations, and detects the information codes written in the sequence program to be displayed. a detecting means; an information extracting means for extracting an input/output parameter used in a sequence instruction from a partial program in a range indicated by the detected information code in the sequence program to be displayed; A programmable controller system comprising display means for displaying output parameters at a predetermined position.